JPS61199580A - Gas shield arc welding equipment - Google Patents

Abstract

PURPOSE:To enable a gas shielded arc welding even in a strongly windy place with increasing a shielding effect by blowing a shielded gas from the shielded gas nozzle provided in a chamber. CONSTITUTION:The shielded gas is blown from shielded gas nozzles 2l, 2l', 2i when the shielded gas is fed from shielded gas feed ports 2d, 2d', 2f. The inside of chamber 2 is then gas-shielded. Side face backing metals 2k, 2k' are controlled with moving in case of welding an electrogas and surrounds the weld zone. The shielding effect is thus increased by gas-shielding the whole welding zone and the gas shielded arc welding can be performed even in a strongly windy place of outdoors, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a gas shield arc welding device for rails, shaped steel, etc., and particularly to the structure of the gas shield.

[Prior Art] As shown in FIGS. 3(a) and 3(bl), the structure of the gas shield of the conventional gas shielded arc welding apparatus of this type includes the following.
Some types cover the tip of the welding nozzle (10) with a cylindrical shielding gas outlet (111), and others have a shielding gas outlet (11) as shown in Figure 4(a). In the figure, (1 is a welding wire, (11 is a shielding gas, and (14 is a member to be welded).

[Problem to be solved by the invention 1 In the case of Figures 3(a) and (b), the diameter of the welding torch becomes large, and the groove width must be made large when performing multi-layer welding of thick plates. It is inefficient because it does not work.

In addition, in the case of Fig. 4 (al, (b)), the welding nozzle (
The part including the shield gas nozzle (111) can be flattened and the gap can be made narrower. The exit is obstructed and is inappropriate.Furthermore, both gas shield structures are extreme shields for the welding arc and molten metal, and there is a risk of drawing in outside air, which is likely to cause welding defects such as blowholes. There is.

[Means for Solving the Problems] In order to solve the above-mentioned problems, the gas shielded arc welding apparatus according to the present invention has a seven-chamber equipped with a chamber and a side pad, which covers the entire welding part. , has a shielding gas outlet inside, into which a welding nozzle is inserted. A pair of side pads are movably provided in the chamber with the member to be welded between them, and have a surface shape corresponding to the shape of the side surface of the member to be welded. This side pad is used during electrogas welding.

[Function] In the gas shielded arc welding device according to the present invention,
Shielding gas is ejected from a shielding gas outlet provided in the chamber to gas-shield the entire welding area. A pair of side pads are moved during electrogas welding of the belly and head of the rail or profile steel to surround the weld.

[Example] Next, an example of the present invention will be described based on the drawings. 1st
FIG. 2 is a cross-sectional explanatory view of a chamber of a gas-shielded arc welding device according to an embodiment of the present invention, and FIG. 2 is a perspective view of the welding device incorporating the chamber.

In Figures 1 and 2, (11, (1') are the rails that are the materials to be welded, (2) is the chamber, and (3) is the welding machine head. In the welding machine head (3), the welding wire (3b) is sent to the small-diameter welding nozzle (3a) by a wire feed motor (3c).The chamber (2) is fixed to the rail (11, (1') by a clamp (2a), A pair of side pads (2k), (
2) is provided. This side pad (2k),
(2') is an enclosure used when electrogas welding the abdomen and head of the rail (11, (1')), and the drive shaft (2J) is rotated by the drive motor (2b). Move by rotation, rail (1), (1'
) is constructed to surround the welded part. Side pad (
2k), (2') has a side gas outlet (21),
(21') is provided, and a head gas outlet (2I) is also provided in the upper part of the chamber, and gas is ejected from these gas outlets (24'', (24''), (2,). The entire welding area is gas-shielded by the shielding gas. (2h) is the back cover of the chamber.
A backing material (2m) is attached, and the ground terminal of the power supply (
2g) is attached. (2d).

(2d'), (2f) are shield gas supply ports, (2c
), (2e') is the side pad (2k), (2'
) cooling water supply port, (2e).

(2e') is a cooling water outlet. Side pad (2k)
, (2) is cooled by passing cooling water through it.

The small diameter welding nozzle (3a) passes through the hole in the insulating plate (2n) provided on the top surface of the chamber (2n).
) is inserted within. The insulating plate (2n) is connected to the welding nozzle (3n).
It has a structure that allows it to slide left and right by moving a).

In the welding apparatus configured as described above, when shielding gas is supplied from the shielding gas supply ports (2d), (2d'), and (2f), the shielding gas outlet (241)
, (24"), (2i). Then, the inside of the chamber (2) is gas-shielded. The side pads (2k) and (2') are electrogas welded as described above. The movement is controlled when surrounding the weld.

Note that although the above embodiment is for rail welding, the arrangement of the shielding gas outlet, the ground terminal, and other constituent members can be changed as appropriate. [Effects of the Invention] The present invention is as described above. Since the entire welding area is gas-shielded, the shielding effect is enhanced and gas-shielded arc welding is now possible even in windy locations such as outdoors. Furthermore, since the welding nozzle and the shielding gas outlet are completely separated, it is possible to reduce the diameter of the welding torch. Also, since it is only necessary to have a gap inside the groove where a small diameter nozzle can fit, the groove width is 12 mm in thin areas such as the rail abdomen.
It became possible to perform electrogas arc welding with the I groove (m). Of course, the same applies not only to rails but also to shaped steel.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional explanatory diagram of a chamber of a gas-shielded arc welding device according to an embodiment of the present invention, FIG. 2 is a perspective view of the welding device, FIGS. 3(A), (B), and 4 ( A)
, (B) are respectively a front explanatory view and a side explanatory view of a conventional gas shield structure. (2)...chamber, (2i), (21),
(21') Sea, 11:4-9 Haruyamaguchi 19 trishi'), Layer; Torizu A (A) Part (A) Figure 3 Figure 4 (B)

Claims (1)

[Claims] It covers the entire welding area and has a shielding gas outlet inside.
A gas-shielded arc welding device comprising: a chamber into which a welding nozzle is inserted; and a pair of side pads movably provided in the chamber to sandwich a member to be welded.